Added HTTP exception classes.

src/HPCloud/Exception.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * @file
+ * The parent exception class for HPCloud.
+ */
+namespace HPCloud;
+/**
+ * The top-level HPCloud exception.
+ *
+ * In most cases, the library will throw a more finely
+ * grained exception, but all exceptions thrown directly
+ * by HPCloud will be an instance of this exception.
+ */
+class Exception extends \Exception {}

src/HPCloud/Transport/AuthorizationException.php

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+<?php
+/**
+ * @file
+ */
+namespace HPCloud\Transport;
+/**
+ * Represents an HTTP 401.
+ */
+class AuthorizationException extends \HPCloud\Exception {}

src/HPCloud/Transport/FileNotFoundException.php

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+<?php
+/**
+ * @file
+ */
+namespace HPCloud\Transport;
+/**
+ * Represents an HTTP File Not Found error.
+ */
+class FileNotFoundException extends \HPCloud\Exception {}

src/HPCloud/Transport/ServerException.php

@@ -0,0 +1,9 @@
+<?php
+/**
+ * @file
+ */
+namespace HPCloud\Transport;
+/**
+ * Represents an HTTP 500 error.
+ */
+class ServerException extends \HPCloud\Exception {}